Do corporate insiders buy stock market dips?

It looked that way in October when the market rout made net buyers out of corporate insiders for the first time since February 2016, according to InsiderInsights.com. Among the companies were American Airlines Group Inc., Apollo Global Management LLC and Tesla Inc.

But last week, as the market dropped again, 24 percent more companies had insiders selling stock in the open market than those with buyers. They included individuals at Charles Schwab Corp. and Procter & Gamble Co.

As the market returns to its October lows, the question now is whether those in the know will signal that a near-term bounce is in the making -- or that this is the end of the great bull market.